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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main(int argc, char const *argv[])
  5. {
  6. 	int n;
  7. 	cin>>n;
  8. 	int count = 0;
  9. 	int arr[n][2];
  10. 	map<int,int>m;
  11.  
  12. 	for (int i = 0; i < n; ++i)
  13. 	{
  14. 		/* code */
  15.  
  16.  
  17. 			/* code */
  18. 			cin>>arr[i][0]>>arr[i][1];
  19. 			if(m.find(arr[i][0]) != m.end()){
  20. 				m[arr[i][0]] += 1;
  21. 			}
  22. 			else
  23. 				m[arr[i][0]] = 1;
  24.  
  25. 			if(m.find(arr[i][1]) != m.end()){
  26. 				m[arr[i][1]] += 1;
  27. 			}
  28. 			else
  29. 				m[arr[i][1]] = 1;
  30.  
  31. 		count++;
  32. 	}
  33.  
  34. 	int d;
  35. 	cin>>d;
  36.  
  37. 	for (int i = 0; i < n ; ++i)
  38. 	{
  39. 		/* code */
  40. 		//cout<<m[arr[i][0]]<<" "<<m[arr[i][1]]<<"\n";
  41. 		if (m[arr[i][0]] > 2 || m[arr[i][1]] > 2)
  42. 			count--;
  43. 	}
  44. 	cout<<count<<"\n";
  45.  
  46.  
  47. 	return 0;
  48. }
Success #stdin #stdout 0s 4184KB
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https://ideone.com/hKkg2B
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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